Publications (173)
Eyes in the sky: Interactions between AGB winds and the interstellar magnetic field
A. J. van Marle, N. L. J. Cox, L. Decin
We aim to examine the role of the interstellar magnetic field in shaping the extended morphologies of slow dusty winds of Asymptotic Giant-branch (AGB) stars in an effort to pin-po…
Herschel PACS and SPIRE imaging of CW Leo
D. Ladjal, M. J. Barlow, M. A. T. Groenewegen +25
Herschel PACS and SPIRE images have been obtained over a 30'x30' area around the well-known carbon star CW Leo (IRC +10 216). An extended structure is found in an incomplete arc of…
Water content and wind acceleration in the envelope around the oxygen-rich AGB star IK Tau as seen by Herschel/HIFI
L. Decin, K. Justtanont, E. De Beck +4
During their asymptotic giant branch, evolution low-mass stars lose a significant fraction of their mass through an intense wind, enriching the interstellar medium with products of…
Snooping around the big dog: VY CMa as seen with Herschel/HIFI
E. De Beck, L. Decin, K. M. Menten +3
In the framework of the HIFISTARS guaranteed time key programme, we measured more than 70 molecular emission lines with high signal-to-noise ratio towards VY CMa using the high-res…
The dusty circumstellar environment of Betelgeuse during the Great Dimming as seen by VLTI/MATISSE
E. Cannon, M. Montargès, A. de Koter +23
The 'Great Dimming' of the prototypical red supergiant Betelgeuse, which occurred between December 2019 and April 2020, gives us unprecedented insight into the processes occurring…
Infrared spectra of TiO2 clusters for hot Jupiter atmospheres
J. P. Sindel, Ch. Helling, D. Gobrecht +2
Context. Clouds seem unavoidable in cool and dense environments, and hence, are necessary to explain observations of exoplanet atmospheres, most recently of WASP 96b with JWST. Und…
Astro2020 Science White Paper: The fundamentals of outflows from evolved stars
E. De Beck, M. L. Boyer, V. Bujarrabal +16
Models of the chemical evolution of the interstellar medium, galaxies, and the Universe rely on our understanding of the amounts and chemical composition of the material returned b…
Spectroscopic determination of the fundamental parameters of 66 B-type stars in the field-of-view of the CoRoT satellite
K. Lefever, J. Puls, T. Morel +3
We aim to determine the fundamental parameters of a sample of B stars with apparent visual magnitudes below 8 in the field-of-view of the CoRoT space mission, from high-resolution…
ATOMIUM: Molecular inventory of 17 oxygen-rich evolved stars observed with ALMA
S. H. J. Wallstrom, T. Danilovich, H. S. P. Muller +35
The dusty winds of cool evolved stars are a major contributor of the newly synthesised material enriching the Galaxy and future generations of stars. However, the details of the ph…
The Long-Lived Disks in the Eta Chamaeleontis Cluster
A. Sicilia-Aguilar, J. Bouwman, A. Juhasz +8
We present IRS spectra and revised MIPS photometry for the 18 members of the Eta Chamaeleontis cluster. Aged 8 Myr, the Eta Cha cluster is one of the few nearby regions within the…
Connecting the dots III: Night side cooling and surface friction affect climates of tidally locked terrestrial planets
L. Carone, R. Keppens, L. Decin
We investigate how night side cooling and surface friction impact surface temperatures and large scale circulation for tidally locked Earth-like planets. For each scenario, we vary…
Spectroscopic parameters for silacyclopropynylidene, SiC, from extensive astronomical observations toward CW Leo (IRC +10216) with the Herschel satellite
H. S. P. Müller, J. Cernicharo, M. Agúndez +5
A molecular line survey has been carried out toward the carbon-rich asymptotic giant branch star CW Leo employing the HIFI instrument on board of the Herschel satellite. Numerous f…
ALMA sub-mm maser and dust distribution of VY Canis Majoris
A. M. S. Richards, C. M. V. Impellizzeri, E. M. Humphreys +25
Cool, evolved stars have copious, enriched winds. The structure of these winds and the way they are accelerated is not well known. We need to improve our understanding by studying…
The Spitzer Spectroscopic Survey of S-type Stars
K. Smolders, P. Neyskens, J. A. D. L. Blommaert +28
S-type AGB stars are thought to be in the transitional phase between M-type and C-type AGB stars. Because of their peculiar chemical composition, one may expect a strong influence…
Sulphur-bearing molecules in AGB stars II: Abundances and distributions of CS and SiS
T. Danilovich, S. Ramstedt, D. Gobrecht +3
We surveyed 20 AGB stars of different chemical types using the APEX telescope, and combined this with an IRAM 30 m and APEX survey of CS and SiS emission towards over 30 S-type sta…
Detection of anhydrous hydrochloric acid, HCl, in IRC+10216 with the Herschel SPIRE and PACS spectrometers
J. Cernicharo, L. Decin, M. J. Barlow +31
We report on the detection of anhydrous hydrochloric acid (hydrogen chlorine, HCl) in the carbon-rich star IRC+10216 using the spectroscopic facilities onboard the Herschel satelli…
ATOMIUM: Continuum emission and evidence of dust enhancement from binary motion
T. Danilovich, N. Samaratunge, Y. Mori +35
Low- and intermediate-mass stars on the asymptotic giant branch (AGB) account for a significant portion of the dust and chemical enrichment in their host galaxy. Here we present AL…
Ensemble asteroseismology of pulsating B-type stars in NGC 6910
D. Moździerski, A. Pigulski, Z. KoÅaczkowski +24
Asteroseismology offers the possibility of probing stellar interiors and testing evolutionary and seismic models. Precise photometry and spectroscopy obtained during multi-site cam…
Competition between gravity waves excited by convection and tides in stars that host a companion
M. Esseldeurs, J. Ahuir, L. Amard +2
Asteroseismology has become a powerful tool in stellar astrophysics, offering unprecedented insights into the internal structures and dynamics of stars. It enables precise characte…
Structure of the outer layers of cool standard stars
S. Dehaes, E. Bauwens, L. Decin +6
Context: Among late-type red giants, an interesting change occurs in the structure of the outer atmospheric layers as one moves to later spectral types in the Hertzsprung-Russell d…
The detached dust shells of AQ And, U Ant, and TT Cyg
F. Kerschbaum, D. Ladjal, R. Ottensamer +14
Detached circumstellar dust shells are detected around three carbon variables using Herschel-PACS. Two of them are already known on the basis of their thermal CO emission and two a…
Constraints on the H2O formation mechanism in the wind of carbon-rich AGB stars
R. Lombaert, L. Decin, P. Royer +13
Context. The recent detection of warm HO vapor emission from the outflows of carbon-rich asymptotic giant branch (AGB) stars challenges the current understanding of circumstell…
ALMA data suggest the presence of a spiral structure in the inner wind of CW Leo
L. Decin, A. M. S. Richards, D. Neufeld +3
(abbreviated) We aim to study the inner wind of the well-known AGB star CW Leo. Different diagnostics probing different geometrical scales have pointed toward a non-homogeneous mas…
Comet-like mineralogy of olivine crystals in an extrasolar proto-Kuiper belt
B. L. de Vries, B. Acke, J. A. D. L. Blommaert +20
Some planetary systems harbour debris disks containing planetesimals such as asteroids and comets. Collisions between such bodies produce small dust particles, the spectral feature…
Warm water vapour in the sooty outflow from a luminous carbon star
L. Decin, M. Agundez, M. J. Barlow +34
In 2001, the discovery of circumstellar water vapour around the ageing carbon star IRC+10216 was announced. This detection challenged the current understanding of chemistry in old…
ATOMIUM: ALMA tracing the origins of molecules in dust forming oxygen rich M-type stars: Motivation, sample, calibration, and initial results
C. A. Gottlieb, L. Decin, A. M. S. Richards +33
This overview paper presents ATOMIUM, a Large Programme in Cycle 6 with the Atacama Large Millimeter-submillimeter Array (ALMA). The goal of ATOMIUM is to understand the dynamics a…
A far-infrared survey of bow shocks and detached shells around AGB stars and red supergiants
N. L. J. Cox, F. Kerschbaum, A. -J. van Marle +16
Far-infrared Herschel/PACS images at 70 and 160 micron of a sample of 78 Galactic evolved stars are used to study the (dust) emission structures, originating from stellar wind-ISM…
ISO-SWS calibration and the accurate modelling of cool-star atmospheres: I. Method
L. Decin, C. Waelkens, K. Eriksson +5
A detailed spectroscopic study of the ISO-SWS data of the red giant Alpha Tau is presented, which enables not only the accurate determination of the stellar parameters of Alpha Tau…
A Benchmark JWST Near-Infrared Spectrum for the Exoplanet WASP-39b
A. L. Carter, E. M. May, N. Espinoza +77
Observing exoplanets through transmission spectroscopy supplies detailed information on their atmospheric composition, physics, and chemistry. Prior to JWST, these observations wer…
Silicon in the dust formation zone of IRC +10216 as observed with PACS and SPIRE on board Herschel
L. Decin, J. Cernicharo, M. J. Barlow +36
The interstellar medium is enriched primarily by matter ejected from evolved low and intermediate mass stars. The outflows from these stars create a circumstellar envelope in which…
Herschel's view into Mira's head
A. Mayer, A. Jorissen, F. Kerschbaum +9
Herschel's PACS instrument observed the environment of the binary system Mira Ceti in the 70 and 160 micron bands. These images reveal bright structures shaped as five broken arcs…
Analytic, dust-independent mass-loss rates for red supergiant winds initiated by turbulent pressure
N. D. Kee, J. O. Sundqvist, L. Decin +2
Context. Red supergiants are observed to undergo vigorous mass-loss. However, to date, no theoretical model has succeeded in explaining the origins of these objects' winds. This st…
Long-term photometric monitoring with the Mercator telescope. Frequencies and multicolour amplitudes of Doradus stars
J. Cuypers, C. Aerts, P. De Cat +21
Gamma Doradus stars are excellent targets for asteroseismology since the gravity modes present in these stars probe the deep stellar interiors. Mode identification will improve the…
e-MERLIN resolves Betelgeuse at wavelength 5 cm
A. M. S. Richards, R. J. Davis, L. Decin +8
Convection, pulsation and magnetic fields have all been suggested as mechanisms for the transport of mass and energy from the optical photosphere of red supergiants, out to the reg…
Discovery of Time Variation of the Intensity of Molecular Lines in IRC+10216 in The Submillimeter and Far Infrared Domains
J. Cernicharo, D. Teyssier, G. Quintana-Lacaci +12
We report on the discovery of strong intensity variations in the high rotational lines of abundant molecular species towards the archetypical circumstellar envelope of IRC+10216. T…
SPH modelling of companion-perturbed AGB outflows including a new morphology classification scheme
S. Maes, W. Homan, J. Malfait +4
Asymptotic giant branch (AGB) stars are known to lose a significant amount of mass by a stellar wind, which controls the remainder of their stellar lifetime. High angular-resolutio…
First results on Martian carbon monoxide from Herschel/HIFI observations
P. Hartogh, M. I. BÅÄcka, C. Jarchow +48
We report on the initial analysis of Herschel/HIFI carbon monoxide (CO) observations of the Martian atmosphere performed between 11 and 16 April 2010. We selected the (7-6) rotatio…
X Her and TX Psc: Two cases of ISM interaction with stellar winds observed by Herschel
A. Jorissen, A. Mayer, S. Van Eck +14
The asymptotic giant branch (AGB) stars X Her and TX Psc have been imaged at 70 and 160 microns with the PACS instrument onboard the Herschel satellite, as part of the large MESS (…
When an old star smolders: On the detection of hydrocarbon emission from S-type AGB stars
K. Smolders, B. Acke, T. Verhoelst +8
Polycyclic aromatic hydrocarbons (PAHs) produce characteristic infrared emission bands that have been observed in a wide range of astrophysical environments, where carbonaceous mat…
MINDS: JWST/NIRCam imaging of the protoplanetary disk PDS 70
V. Christiaens, M. Samland, Th. Henning +28
Context. Two protoplanets have recently been discovered within the PDS 70 protoplanetary disk. JWST/NIRCam offers a unique opportunity to characterize them and their birth environm…
Large-scale environments of binary AGB stars probed by Herschel - I. Morphology statistics and case studies of R Aquarii and W Aquilae
A. Mayer, A. Jorissen, F. Kerschbaum +14
The Mass loss of Evolved StarS (MESS) sample offers a selection of 78 Asymptotic Giant Branch (AGB) stars and Red Supergiants (RSGs) observed with the PACS photometer on-board Hers…
PACS and SPIRE range spectroscopy of cool, evolved stars
Dries Nicolaes, M. A. T. Groenewegen, P. Royer +3
Context: At the end of their lives AGB stars are prolific producers of dust and gas. The details of this mass-loss process are still not understood very well. Herschel PACS and SPI…
Determining the effects of clumping and porosity on the chemistry in a non-uniform AGB outflow
M. Van de Sande, J. O. Sundqvist, T. J. Millar +5
(abridged) In the inner regions of AGB outflows, several molecules have been detected with abundances much higher than those predicted from thermodynamic equilibrium (TE) chemical…
Herschel-SPIRE FTS spectroscopy of the carbon-rich objects AFGL 2688, AFGL 618 and NGC 7027
R. Wesson, J. Cernicharo, M. J. Barlow +22
We present far-infrared and submillimetre spectra of three carbon-rich evolved objects, AFGL 2688, AFGL 618 and NGC 7027. The spectra were obtained with the SPIRE Fourier transform…
ATOMIUM: Probing the inner wind of evolved O-rich stars with new, highly excited HO and OH lines
A. Baudry, K. T. Wong, S. Etoka +17
Water and the hydroxyl radical are major constituents of the envelope of O-rich late-type stars. Transitions involving energy levels that are highly excited have been observed in b…
Dusty wind of W Hya. Multi-wavelength modelling of the present-day and recent mass-loss
T. Khouri, L. B. F. M. Waters, A. de Koter +5
Low- and intermediate-mass stars go through a period of intense mass-loss at the end of their lives in a phase known as the asymptotic giant branch (AGB). During the AGB a signific…
Rotational spectra of vibrationally excited AlO and TiO in oxygen rich stars
T. Danilovich, C. A. Gottlieb, L. Decin +6
Rotational transitions in vibrationally excited AlO and TiO -- two possible precursors of dust -- were observed in the 300 GHz range (1 mm wavelength) towards the oxygen rich AGB s…
HIFI detection of HF in the carbon star envelope IRC +10216
M. Agundez, J. Cernicharo, L. B. F. M. Waters +5
We report the detection of emission in the J=1-0 rotational transition of hydrogen fluoride (HF), together with observations of the J=1-0 to J=3-2 rotational lines of H35Cl and H37…
Information content of JWST transmission spectroscopy of the exoplanet HAT-P-12b from the optical to the mid-infrared
L. Heinke, M. Min, J. Bouwman +18
The James Webb Space Telescope (JWST) provides low- to medium-resolution spectra with unprecedented precision and broad near- to mid-infrared wavelength coverage, enabling detailed…
(Sub)stellar companions shape the winds of evolved stars
L. Decin, M. Montargès, A. M. S. Richards +32
Binary interactions dominate the evolution of massive stars, but their role is less clear for low- and intermediate-mass stars. The evolution of a spherical wind from an asymptotic…
Herschel/HIFI observations of high-J CO transitions in the protoplanetary nebula CRL618
V. Bujarrabal, J. Alcolea, R. Soria-Ruiz +25
We performed Herschel/HIFI observations of several CO lines in the far-infrared/sub-mm in the protoplanetary nebula CRL618. The high spectral resolution provided by HIFI allows mea…
ALMA Observations of Anisotropic Dust Mass-loss in the Inner Circumstellar Environment of the Red Supergiant VY Canis Majoris
E. O'Gorman, W. Vlemmings, A. M. S. Richards +8
The processes leading to dust formation and the subsequent role it plays in driving mass loss in cool evolved stars is an area of intense study. Here we present high resolution ALM…
HIFI Observations of Water in the Atmosphere of Comet C/2008 Q3 (Garradd)
P. Hartogh, J. Crovisier, M. de Val-Borro +42
High-resolution far-infrared and sub-millimetre spectroscopy of water lines is an important tool to understand the physical and chemical properties of cometary atmospheres. We pres…
Tidal Dissipation in Evolved Low and Intermediate Mass Stars
M. Esseldeurs, S. Mathis, L. Decin
As the observed occurrence for planets or stellar companions orbiting low and intermediate-mass evolved stars is increasing, so does the importance of understanding and evaluating…
Estimating Stellar Parameters from Spectra using a Hierarchical Bayesian Approach
Z. Shkedy, L. Decin, G. Molenberghs +1
A method is developed for fitting theoretically predicted astronomical spectra to an observed spectrum. Using a hierarchical Bayesian principle, the method takes both systematic an…
The mass-loss rates of red supergiants at low metallicity: Detection of rotational CO emission from two red supergiants in the Large Magellanic Cloud
Mikako Matsuura, B. Sargent, Bruce Swinyard +9
Using the PACS and SPIRE spectrometers on-board the Herschel Space Observatory, we obtained spectra of two red supergiants (RSGs) in the Large Magellanic Cloud (LMC). Multiple rota…
Detection of CO, CO, and HO in the atmosphere of the warm sub-Saturn HAT-P-12b
N. Crouzet, B. Edwards, T. Konings +29
The chemical composition of warm gas giant exoplanet atmospheres (with Teq < 1000 K) is not well known due to the lack of observational constraints. HAT-P-12 b is a warm, sub-Satur…
ATOMIUM: Inner circumstellar envelopes of oxygen-rich AGB stars as revealed by highly excited SiO lines
B. Pimpanuwat, S. Etoka, M. D. Gray +14
Silicon monoxide (SiO) traces the physical conditions and dynamics in the circumstellar envelopes (CSEs) of AGB stars. We present high-resolution ALMA Band 6 observations of highly…
The Hidden Clumps in VY CMa Uncovered by ALMA
Roberta M. Humphreys, A. M. S. Richards, Kris Davidson +3
The red hypergiant VY CMa is famous for its very visible record of high mass loss events. Recent CO observations with ALMA revealed three previously unknown large scale outflows (P…
First results of Herschel/PACS observations of Neptune
E. Lellouch, P. Hartogh, H. Feuchtgruber +51
We report on the initial analysis of a Herschel/PACS full range spectrum of Neptune, covering the 51-220 micrometer range with a mean resolving power of ~ 3000, and complemented by…
The wind of W Hya as seen by Herschel - I. The CO envelope
T. Khouri, A. de Koter, L. Decin +25
Asymptotic giant branch (AGB) stars lose their envelopes by means of a stellar wind whose driving mechanism is not understood well. Characterizing the composition and thermal and d…
Water production in comet 81P/Wild 2 as determined by Herschel/HIFI
M. de Val-Borro, P. Hartogh, J. Crovisier +42
The high spectral resolution and sensitivity of Herschel/HIFI allows for the detection of multiple rotational water lines and accurate determinations of water production rates in c…
Discovery of multiple dust shells beyond 1 arcmin in the circumstellar envelope of IRC+10216 using Herschel/PACS
L. Decin, P. Royer, N. L. J. Cox +9
We present new Herschel/PACS images at 70, 100, and 160 micron of the well-known, nearby, carbon-rich asymptotic giant branch star IRC+10216 revealing multiple dust shells in its c…
Interferometric view into RT Pav's long secondary period. binary vs oscillatory convective modes
B. Courtney-Barrer, X. Haubois, P. Wood +6
Long secondary periods (LSPs) occur in about one-third of evolved stars, yet their origin remains unclear. The leading explanations are oscillatory convective modes and a binary co…
MICONIC: JWST/MIRI-MRS reveals heavily reprocessed PAH emission in the circum-nuclear disc of Centaurus A
L. Pantoni, M. Baes, L. Decin +23
Polycyclic aromatic hydrocarbons (PAHs) are key dust components in galaxies and play a fundamental role in the physics of the interstellar medium (ISM), yet their response to AGN f…
Wind morphology around cool evolved stars in binaries: the case of slowly accelerating oxygen-rich outflows
I. El Mellah, J. Bolte, L. Decin +2
The late stellar evolutionary phases of low and intermediate-mass stars are strongly constrained by their mass-loss rates. The wind surrounding cool evolved stars frequently shows…
The inhomogeneous sub-millimeter atmosphere of Betelgeuse
E. O'Gorman, P. Kervella, G. M. Harper +4
The mechanisms responsible for heating the extended atmospheres of early-M spectral-type supergiants are poorly understood. So too is the subsequent role these mechanisms play in d…
The variable mass loss of the AGB star WX Psc as traced by the CO J=1-0 through 7-6 lines and the dust emission
L. Decin, S. Hony, A. de Koter +3
Low and intermediate mass stars lose a significant fraction of their mass through a dust-driven wind during the Asymptotic Giant Branch (AGB) phase. Recent studies show that winds…
The unusual 3D distribution of NaCl around the AGB star IK Tau
A. Coenegrachts, T. Danilovich, F. De Ceuster +1
NaCl is a diatomic molecule with a large dipole moment, which allows for its detection even at relatively small abundances. It has been detected towards several evolved stars, amon…
MARCS-Model Stellar Atmospheres, and Their Application to the Photometric Calibration of the Spitzer-IRS
L. Decin, P. W. Morris, P. N. Appleton +3
We describe state-of-the-art MARCS-code model atmospheres generated for a group of A dwarf, G dwarf, and late-G to mid-K giant standard stars, selected to photometrically calibrate…
Evidence for SiO cloud nucleation in the rogue planet PSO J318
P. Mollière, H. Kühnle, E. C. Matthews +25
Silicate clouds are known to significantly impact the spectra of late L-type brown dwarfs, with observable absorption features at ~ 10 micron. JWST has reopened our window to the m…
Towards ensemble asteroseismology of the young open clusters Chi Persei and NGC 6910
S. Saesen, A. Pigulski, F. Carrier +71
As a result of the variability survey in Chi Persei and NGC6910, the number of Beta Cep stars that are members of these two open clusters is increased to twenty stars, nine in NGC6…
Absolute Physical Calibration in the Infrared
G. H. Rieke, M. Blaylock, L. Decin +11
We determine an absolute calibration for the MIPS 24 microns band and recommend adjustments to the published calibrations for 2MASS, IRAC, and IRAS photometry to put them on the sa…
Continuum emission around AGB stars at 1.2 mm
S. Dehaes, M. A. T. Groenewegen, L. Decin +3
It is generally acknowledged that the mass loss of Asymptotic Giant Branch (AGB) stars undergoes variations on different time scales. We constructed models for the dust envelopes f…
Sensitivity study of chemistry in AGB outflows using chemical kinetics
S. Maes, M. Van de Sande, T. Danilovich +2
Asymptotic Giant Branch (AGB) stars shed a significant amount of their mass in the form of a stellar wind, creating a vast circumstellar envelope (CSE). Owing to the ideal combinat…
Reduction of the maximum mass-loss rate of OH/IR stars due to unnoticed binary interaction
L. Decin, W. Homan, T. Danilovich +12
In 1981, the idea of a superwind that ends the life of cool giant stars was proposed. Extreme OH/IR-stars develop superwinds with the highest mass-loss rates known so far, up to a…
ISO-SWS calibration and the accurate modelling of cool-star atmospheres - III. A0 to G2 stars
L. Decin, B. Vandenbussche, C. Waelkens +4
Vega, Sirius, Beta Leo, Alpha Car and Alpha Cen A belong to a sample of twenty stellar sources used for the calibration of the detectors of the Short-Wavelength Spectrometer on boa…
Inner dusty envelope of the AGB stars W~Hydrae, SW\,Virginis, and R~Crateris using SPHERE/ZIMPOL
T. Khouri, W. H. T. Vlemmings, C. Paladini +8
Stars with initial masses between and 8~ present copious mass loss during the asymptotic giant branch (AGB) at the end of their lives. The accepted mass-loss mec…
Herschel/HIFI observation of highly excited rotational lines of HNC toward IRC +10 216
F. Daniel, M. Agúndez, J. Cernicharo +6
We report the detection in emission of various highly excited rotational transitions of HNC (J = 6-5 through J =12-11) toward the carbon-star envelope IRC +10 216 using the HIFI in…
History of two mass loss processes in VY CMa. Fast outflows carving older ejecta
G. Quintana-Lacaci, L. Velilla-Prieto, M. Agúndez +4
Red supergiant stars (RSGs, Minit = 10-40Msun) are known to eject large amounts of material, as much as half of their initial mass during this evolutionary phase. However, the proc…
A rotational line CO cooling rate prescription for AGB outflows
T. Ceulemans, F. De Ceuster, O. Vermeulen +1
Asymptotic Giant Branch (AGB) stars significantly contribute to the chemical composition of the universe. In their outflows, complex chemistry takes place, which critically depends…
ALMA spectral line and imaging survey of a low and a high mass-loss rate AGB star between 335 and 362 GHz
L. Decin, A. M. S. Richards, T. Danilovich +2
A spectral line and imaging survey of the low mass-loss rate AGB star R Dor (Mdot ~ 1e-7 Msun/yr) and the high mass-loss rate AGB star IK Tau (Mdot ~5e-6 Msun/yr) was made with ALM…
Herschel/HIFI observations of O-rich AGB stars : molecular inventory
K. Justtanont, T. Khouri, M. Maercker +15
Spectra, taken with the heterodyne instrument, HIFI, aboard the Herschel Space Observatory, of O-rich asymptotic giant branch (AGB) stars which form part of the guaranteed time key…
The wind of W Hya as seen by Herschel. II. The molecular envelope of W Hya
T. Khouri, A. de Koter, L. Decin +18
The evolution of low- and intermediate-mass stars on the asymptotic giant branch (AGB) is mainly controlled by the rate at which these stars lose mass in a stellar wind. Understand…
Dust-gas chemistry in AGB outflows: Chemical modelling of dust-gas chemistry within AGB outflows I. Effect on the gas-phase chemistry
M. Van de Sande, C. Walsh, T. P. Mangan +1
Chemical modelling of AGB outflows is typically focused on either non-thermodynamic equilibrium chemistry in the inner region or photon-driven chemistry in the outer region. We inc…
Method and new tabulations for flux-weighted line-opacity and radiation line-force in supersonic media
L. G. Poniatowski, N. D. Kee, J. O. Sundqvist +7
In accelerating and supersonic media, the interaction of photons with spectral lines can be of ultimate importance. However, fully accounting for such line forces currently can onl…
ALMA observations of the nearby AGB star L2 Puppis - I. Mass of the central star and detection of a candidate planet
P. Kervella, W. Homan, A. M. S. Richards +4
Six billion years from now, while evolving on the asymptotic giant branch (AGB), the Sun will metamorphose from a red giant into a beautiful planetary nebula. This spectacular evol…
Herschel/HIFI observations of the circumstellar ammonia lines in IRC+10216
M. R. Schmidt, J. H. He, R. Szczerba +14
New high-resolution far-infrared (FIR) observations of both ortho- and para-NH3 transitions toward IRC+10216 were obtained with Herschel, with the goal of determining the ammonia a…
HIFISTARS Herschel/HIFI observations of VY Canis Majoris. Molecular-line inventory of the envelope around the largest known star
J. Alcolea, V. Bujarrabal, P. Planesas +16
To gain insight into the physical conditions and kinematics of the warm (100-1000 K) gas around the red hyper-giant VY CMa, we performed sensitive high spectral resolution observat…
ISO-SWS observations of interstellar solid 13CO2: heated ice and the Galactic 12C/13C abundance ratio
A. C. A. Boogert, P. Ehrenfreund, P. A. Gerakines +7
We present observations of the stretching mode of 13CO2 ice along 13 lines of sight in the Galaxy, using the Short Wavelength Spectrometer on board of the Infrared Space Observator…
Constraints on metal oxide and metal hydroxide abundances in the winds of AGB stars - Potential detection of FeO in R Dor
L. Decin, T. Danilovich, D. Gobrecht +4
Using ALMA, we observed the stellar wind of two oxygen-rich Asymptotic Giant Branch (AGB) stars, IK Tau and R Dor, between 335 and 362 GHz. One aim was to detect metal oxides and m…
Pure rotational spectra of TiO and TiO_2 in VY Canis Majoris
T. Kaminski, C. A. Gottlieb, K. M. Menten +7
We report the first detection of pure rotational transitions of TiO and TiO_2 at (sub-)millimeter wavelengths towards the red supergiant VY CMa. A rotational temperature, T_rot, of…
Dynamically inflated wind models of classical Wolf-Rayet stars
L. G. Poniatowski, J. O. Sundqvist, N. D. Kee +6
Vigorous mass loss in the classical Wolf-Rayet (WR) phase is important for the late evolution and final fate of massive stars. We develop spherically symmetric time-dependent and s…
Water isotopologues in the circumstellar envelopes of M-type AGB stars
Taïssa Danilovich, R. Lombaert, L. Decin +3
AIM: In this study we examine rotational emission lines of two isotopologues of water: HO and HO. By determining the abundances of these molecules, we aim to…
ALMA observations of TiO around VY Canis Majoris
E. De Beck, W. Vlemmings, S. Muller +7
Titanium dioxide, TiO, is a refractory species that could play a crucial role in the dust-condensation sequence around oxygen-rich evolved stars. To date, gas phase TiO has…
The ALMA detection of CO rotational line emission in AGB stars in the Large Magellanic Cloud
M. A. T. Groenewegen, W. H. T. Vlemmings, P. Marigo +21
Context: Low- and intermediate-mass stars lose most of their stellar mass at the end of their lives on the asymptotic giant branch (AGB). Determining gas and dust mass-loss rates (…
Nucleosynthesis in AGB stars traced by oxygen isotopic ratios. I - Determining the stellar initial mass by means of the O/O ratio
R. De Nutte, L. Decin, H. Olofsson +8
The aim of this paper is to investigate the O/O ratio for a sample of AGB stars, containing M-, S- and C-type stars. These ratios are evaluated in relation to fundame…
Detection of the 69 μm band of crystalline forsterite in the Herschel MESS-program
B. L. de Vries, D. Klotz, R. Lombaert +13
In this article we present the detection of the 69 μm band of the crystalline olivine forsterite within the MESS key program of Herschel. We determine the temperature of the forst…
Is Arcturus a well-understood K giant? Test of model atmospheres and potential companion detection by near-infrared interferometry
T. Verhoelst, P. J. Bordé, G. Perrin +8
We present near-IR interferometric measurements of the K1.5 giant Arcturus (alpha Bootis), obtained at the IOTA interferometer with the FLUOR instrument, in four narrow filters wit…
The salty emission of the intermediate-mass AGB star OH 30.1 -0.7
T. Danilovich, A. M. S. Richards, M. Van de Sande +17
We analyse continuum and molecular emission, observed with ALMA, from the dust-enshrouded intermediate-mass AGB star OH 30.1 -0.7. We find a secondary peak in the continuum maps, "…